Gyro servo

[Felt]

Hello all...

I just purchased the blade 400 and went ahead and lowered my ball joint down to the second hole and raised the servo one hole. I also made sure the slider was centered and the servo head was 90 degrees. Now for my question..... Why does my servo arm not center up to the 90 degree point? It will be off centered to the right or left by 5 degrees or so. I will have to wiggle the rudder control stick back and forth to get it back centered. Is this do to the crappy stock servo? Thanks.

[LockMD]

Hello all...

I just purchased the blade 400 and went ahead and lowered my ball joint down to the second hole and raised the servo one hole. I also made sure the slider was centered and the servo head was 90 degrees. Now for my question..... Why does my servo arm not center up to the 90 degree point? It will be off centered to the right or left by 5 degrees or so. I will have to wiggle the rudder control stick back and forth to get it back centered. Is this do to the crappy stock servo? Thanks.


In HH mode it should NOT center it should HOLD hence the name heading hold, it rate mode it WILL center very quickly.

[Felt]

ok, that makes sense. For some reason I was thinking that it should center up everytime, even when the copter is on the ground without the motor running. Thanks for the quick reply.

[mupchu]

If you have not watched finless's video on gyro setup (not the 401, the align one) now would be a good time. He also goes over creep and how to get rid of it.

[Felt]

thanks :thumbup:

[Roehl]

will it makes a difference if I upgraded the tail servo with stock gyro? servo seems too slow to react during sudden tail movement.

[drd]

Roele - I put a Futaba 3154 on tail with stock gyro - its small, fast, and has held up in two boom strikes - it really holds well

[Roehl]

I just installed a JR 3400G with a stock Gyro and everything seems to got reversed. I switch the gyro in DS and Reverse mode. On the TX, I put the rudder on Normal and Gyro on Reverse just to put everything back to normal. Did I set it up correctly?

Please advice. thanks!

[sokal]

dont rev the gyro leave in the Normal mode

if input is opposit rev the rudder
if compensation is opposite rev on the gyro itself

if you still using the stock gyro get the rod as close to the screw as you can thats the only way to limit the throw otherwise u will burn the servo out from binding

or upgrade the gyro to one that can limit the throw

[Roehl]

ok I just did what you recommend but the nose keeps going to the left at 65% on gyro. The whole heli would spin counter clockwise.

[sokal]

ok I just did what you recommend but the nose keeps going to the left at 65% on gyro. The whole heli would spin counter clockwise.
when you installed the servo did you center the servo arm and slider in rate mode
also dont use subtrim or trim

[Roehl]

yes, slider and servo is centered in 50% rate mode.

[sokal]

yes, slider and servo is centered in 50% rate mode.
50% is still HH

go lower

like 40% to be certain

[Wolfpackin]

when you installed the servo did you center the servo arm and slider in rate mode
also dont use subtrim or trim

I repectfully disagree.

With the G110 it is absolutely OK to use subtrim. Both Finless Bob and the G110 manual state subtrim should be used to stop servo creep in HH mode.

Also, "centering the servo arm and slider" in rate mode is a misnomer.
While it's true the servo arm should be at 90 degrees to the pushrod the slider should actually be positioned such that there is no yaw in rate mode and that is usually not in the center of the tail rotor shaft but closer to the tail case.

Once the tail holds well in rate mode then switch to HH mode and use subtrim to stop the tail from drifting or servo creeping.

Again, these are not my own thoughts, I have very few of those. This comes from Finless Bob's video on Align/Telebee and similar Piezo Gyros, the downloadable G110 manual and the guide by x400tuning for gyro setup.

I think that x400tuning states it best by saying the golden rule for this type of gyro is in rate mode you make mechanical adjustments by changing the pushrod length (which changes the position of the slider) and in HH mode you use subtrim to stop tail drift.

That's my $.02

[sokal]

I repectfully disagree.

With the G110 it is absolutely OK to use subtrim. Both Finless Bob and the G110 manual state subtrim should be used to stop servo creep in HH mode.

Also, "centering the servo arm and slider" in rate mode is a misnomer.
While it's true the servo arm should be at 90 degrees to the pushrod the slider should actually be positioned such that there is no yaw in rate mode and that is usually not in the center of the tail rotor shaft but closer to the tail case.

Once the tail holds well in rate mode then switch to HH mode and use subtrim to stop the tail from drifting or servo creeping.

Again, these are not my own thoughts, I have very few of those. This comes from Finless Bob's video on Align/Telebee and similar Piezo Gyros, the downloadable G110 manual and the guide by x400tuning for gyro setup.

I think that x400tuning states it best by saying the golden rule for this type of gyro is in rate mode you make mechanical adjustments by changing the pushrod length (which changes the position of the slider) and in HH mode you use subtrim to stop tail drift.

That's my $.02
well i have no sub trim center slider and no trim
and hands off no drift

to say that if you center the tail blades 0 pitch what counteracting the tourque from the main rotor. as you apply power you also have to apply rudder but lucky for us the gyro will do it for us
i found when i used subtrim it gave a spung effect when stoping the tailturn
but im no expert and just a hobbiest

[Wolfpackin]

well i have no sub trim center slider and no trim
and hands off no drift



You're using the GY401, I thought he was asking about the stock gyro which operates and is set up differently.:confused:

[Redfire SVT]

Well this is how I setup my stock 110 gyro with a HS65MG servo:

Zeroed everything out
Used supplied cross shaped servo horn
Cut off unused arms
Used stock rear mount (on frame) and flipped the boom mount
Had to use a servo horn cutoff as a washer for the boom mount to servo
Install the ball on the inside, inner hole
File the top of the servo horn hub slightly to clear pushrod
Installed as close to 90* as possible
Checked for binding with the slider centered- none
Travel to both ends- the same and just shy of touching
Hovered in rate mode and worked my way up to 80% which is HH

For the most part it hovers pretty good in HH. Sometimes I will add a click or two of regular trim, sometimes more when the heli hasn't got used to the heat outdors.

I'm new to helis and for the very basic stuff like hovering and forward flight, the stock gyro is doing a good job. I will go with this until I get past crash N burn. Sure would suck to bust up a 401 on a stupid noob move.

[eugenefelisco]

Redfire SVT,

If your having a hard time dialing the gyro to rate. Another technique is to plug the tail servo jack directly to the rudder input in the rx. This way you can center the horn and the tail slider without any troubles. Then when you get it centered pull it(jack) out and plug your servo thru the gyro and your set. Its basic and it works for me. Let us know if it works to you.
Eugene

[Roehl]

- Servo in 90deg.
- Center the slider in 40% rate mode.
- When I switch to HH mode, the slider moves to the right (view from the rear). In this case it won't counter act the blades rotational force. I was able to stabilize the tail using the sub-trim, moving the slider a bit to the left (view from the rear). I tested the gyro, swinging the tail and it counter acts the force.

Now I just need to deal with drifting to the left. I think my next upgrade would be the 401 gyro which is abit more simple to setup.

[mupchu]

I am not sure if I got the ultra g110 gyro by accident in my blade, but it was really easy to setup.

I did do the chinese weight mod, and change the grips out for trex grips (so I could run KB dream blades).

Here are the steps I took:

watch the finless video on setting up a piezio gyro (not 401) - ** very important step **

put the gyro into rate mode (set radio to 0%)

center the tail servo arm to 90, and adjust the linkage so the pitch slider is centered (0 pitch) on the tail.

put the gyro into HH mode (set radio to 70%)

use subtrim to remove any creep. ** this is explained in the video **

I then spun up my heli, and it held solid, no creep.

[LockMD]

- Center the slider in 40% rate mode.




Not sure if this matters or not, but when I set the tail I use 25% gain (which is 50% rate mode)

also dont forget to re-bind.

[sokal]

[quote=mupchu;683751]
center the tail servo arm to 90, and adjust the linkage so the pitch slider is centered (0 pitch) on the tail.
quote]
centered slider is not 0 pitch in tail blades
thier has to be some sort of anti torque to stop the body from spinning in the opposit direction of the main blades

the tail rotor is not just for direction control
main purpose is antitorque

i guess ill make a vid to show what i mean buy pitch required in tail in a hover

[mupchu]

I am pretty sure that the mechanical center of the pitch slider was 0 pitch, I would need to check it at home to be 100%.

If I was running in rate mode you are correct I would need to have the some pitch to keep the tail from spinning, however I am running in HH mode. In HH mode the gyro should be making the adjustment so that the tail stays where you put it. The only purpose of setting the servo at 90 and the pitch slider in the center is to make sure the gyro has a full range of movement possible.

[Roehl]

On Standard Rate Mode, when you move the tail, will the gyro compenstates? So what is the difference between Standard Rate mode and Hold Heading/Heading Lock mode?

Am still trying to understand the whole physics of the heli. :cheers

[LockMD]

On Standard Rate Mode, when you move the tail, will the gyro compenstates? So what is the difference between Standard Rate mode and Hold Heading/Heading Lock mode?

Am still trying to understand the whole physics of the heli. :cheers

shouldnt fly in rate mode, I use that for setup only 25% gain = 50% rate mode. HH is just that it should hold. (in rate mode) the servo will center itselft pretty quick.